{"id":"CVE-2021-38604","title":"In librt in the GNU C Library (aka glibc) through 2.34, sysdeps/unix/sysv/linux/mq_notify.c mishandles certain NOTIFY_REMOVED data, leading to a NULL pointer dereference","summary":"In librt in the GNU C Library (aka glibc) through 2.34, sysdeps/unix/sysv/linux/mq_notify.c mishandles certain NOTIFY_REMOVED data, leading to a NULL pointer dereference. NOTE: this vulnerability was introduced as a side effect of the CV…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-476","CWE-476"],"vendor":"gnu","product":"glibc","affected":["glibc <= 2.34","fedora = 35","communications_cloud_native_core_binding_support_function = 22.1.3","communications_cloud_native_core_network_function_cloud_native_environment = 22.1.0","communications_cloud_native_core_network_repository_function = 22.1.2","communications_cloud_native_core_network_repository_function = 22.2.0","communications_cloud_native_core_security_edge_protection_proxy = 22.1.1","communications_cloud_native_core_unified_data_repository = 22.2.0","enterprise_operations_monitor = 4.3","enterprise_operations_monitor = 4.4","enterprise_operations_monitor = 5.0"],"published":"2021-08-12","updated":"2026-10-14","sourceUpdated":"2026-10-14T12:17:15.650","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2021-38604","references":[{"url":"https://blog.tuxcare.com/cve/tuxcare-team-identifies-cve-2021-38604-a-new-vulnerability-in-glibc","label":"cve@mitre.org"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GYEXYM37RCJWJ6B5KQUYQI4NZBDDYSXP/","label":"cve@mitre.org"},{"url":"https://security.gentoo.org/glsa/202208-24","label":"cve@mitre.org"},{"url":"https://security.netapp.com/advisory/ntap-20210909-0005/","label":"cve@mitre.org"},{"url":"https://sourceware.org/bugzilla/show_bug.cgi?id=28213","label":"cve@mitre.org"},{"url":"https://sourceware.org/git/?p=glibc.git%3Ba=commit%3Bh=4cc79c217744743077bf7a0ec5e0a4318f1e6641","label":"cve@mitre.org"},{"url":"https://sourceware.org/git/?p=glibc.git%3Ba=commit%3Bh=b805aebd42364fe696e417808a700fdb9800c9e8","label":"cve@mitre.org"},{"url":"https://www.oracle.com/security-alerts/cpujul2022.html","label":"cve@mitre.org"},{"url":"https://blog.tuxcare.com/cve/tuxcare-team-identifies-cve-2021-38604-a-new-vulnerability-in-glibc","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GYEXYM37RCJWJ6B5KQUYQI4NZBDDYSXP/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/202208-24","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20210909-0005/","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://sourceware.org/bugzilla/show_bug.cgi?id=28213","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://sourceware.org/git/?p=glibc.git%3Ba=commit%3Bh=4cc79c217744743077bf7a0ec5e0a4318f1e6641","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://sourceware.org/git/?p=glibc.git%3Ba=commit%3Bh=b805aebd42364fe696e417808a700fdb9800c9e8","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.oracle.com/security-alerts/cpujul2022.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-398330.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-831302.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd"],"epss":0.03045,"epssPercentile":0.87209,"ingestedAt":"2026-10-14T12:29:10.825Z","slug":"CVE-2021-38604","body":"## Overview\n\nIn librt in the GNU C Library (aka glibc) through 2.34, sysdeps/unix/sysv/linux/mq_notify.c mishandles certain NOTIFY_REMOVED data, leading to a NULL pointer dereference. NOTE: this vulnerability was introduced as a side effect of the CVE-2021-33574 fix.\n\n## Affected\n\n- `glibc <= 2.34`\n- `fedora = 35`\n- `communications_cloud_native_core_binding_support_function = 22.1.3`\n- `communications_cloud_native_core_network_function_cloud_native_environment = 22.1.0`\n- `communications_cloud_native_core_network_repository_function = 22.1.2`\n- `communications_cloud_native_core_network_repository_function = 22.2.0`\n- `communications_cloud_native_core_security_edge_protection_proxy = 22.1.1`\n- `communications_cloud_native_core_unified_data_repository = 22.2.0`\n- `enterprise_operations_monitor = 4.3`\n- `enterprise_operations_monitor = 4.4`\n- `enterprise_operations_monitor = 5.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":41.3,"likelihood":0.6,"exploitation":0,"ransomware":0},"changes":[]}